Update ui_strings.h

Ukrainian translation added
Update ui_dropdown.h

Ukrainian translation added
Add uk lang to ui.
add uk strings
Merge branch 'master' of https://github.com/burunduk/uTox into burunduk-master

Conflicts:
	ui_dropdown.h
	ui_strings.h
Merge branch 'burunduk-master' into patch-2

Merging with burunduk's master branch. ui strings added for Ukrainian translation.
Merge pull request #290 from v2e/patch-2

Ukrainian translation added